Description

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The `ExtractAttachmentsPreprocessor` passes attachment filenames directly to the filesystem without sanitization, enabling path traversal attacks. This vulnerability provides complete control over both the destination path and file extension. Version 7.17.1 contains a patch.

INFO

Published Date :

2026-04-21T00:14:59.937Z

Last Modified :

2026-04-21T19:49:24.475Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-39377 vulnerability.

Vendors Products
Jupyter
  • Nbconvert
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-39377.

URL Resource
https://github.com/jupyter/nbconvert/releases/tag/v7.17.1 cve-icon cve-icon cve-icon
https://github.com/jupyter/nbconvert/security/advisories/GHSA-4c99-qj7h-p3vg cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-39377 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-39377 cve-icon
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